State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China; State Key Laboratory of Transducer Technology, Shanghai 200050, PR China.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
J Colloid Interface Sci. 2020 Feb 15;560:284-292. doi: 10.1016/j.jcis.2019.10.080. Epub 2019 Oct 22.
In this work, the chitosan wrapped multiwalled carbon nanotubes (MWCNTs-CS) composited material was prepared by surface deposition and crosslinking method. This mild process can maintain the unique properties of the original carbon nanotubes intact. The morphological character of MWCNTs-CS was examined via Fourier transform infrared spectroscopy and field emission scanning electron microscopy. MWCNTs-CS was used as sensing film to fabricate quartz crystal microbalance (QCM) humidity sensors. The optimized sensor possesses high response sensitivity (46.7 Hz/% RH), negligible humidity hysteresis (around 1.1% RH), quick response and recovery time (75 s/34 s), and remarkable reversibility, repeatability, long-term stability and selectivity. Langmuir adsorption isotherm model was used to study the adsorption process of water molecules on MWCNTs-CS film, and the Gibbs free adsorption energy was calculated as -21.85 kJ/mol. By combining the good mechanic properties of MWCNTs and the high hydrophilia of chitosan, the MWCNTs-CS composites are promising for humidity sensing application.
在这项工作中，采用表面沉积和交联的方法制备了壳聚糖包裹的多壁碳纳米管（MWCNTs-CS）复合材料。这种温和的处理过程可以保持原始碳纳米管的独特性能完好无损。通过傅里叶变换红外光谱和场发射扫描电子显微镜对 MWCNTs-CS 的形态特征进行了研究。将 MWCNTs-CS 用作传感膜来制备石英晶体微天平（QCM）湿度传感器。优化后的传感器具有高响应灵敏度（46.7 Hz/% RH）、可忽略的湿度滞后（约 1.1% RH）、快速的响应和恢复时间（75 s/34 s）以及显著的可逆性、重复性、长期稳定性和选择性。通过 Langmuir 吸附等温线模型研究了水分子在 MWCNTs-CS 薄膜上的吸附过程，并计算了吉布斯自由吸附能为-21.85 kJ/mol。通过结合 MWCNTs 的良好力学性能和壳聚糖的高亲水性，MWCNTs-CS 复合材料有望用于湿度传感应用。
